New Arc'teryx Covert Fleece Size: Medium color: Black Heather II Covert performance and style in a midweight fleece made from recycled materials. Alpenex II fleece – a 100% recycled polyester – The Covert’s thermally efficient, soft, and breathable. The tall collar ups the warmth, articulated patterning gives you freedom to move, and the deep front zip ventilates and makes pulling it on and off easy.